Tc78 vs pt88
Tc78 vs pt88 Okay I have a tc78 .96ar currently. The motor is a 402 ls2. I keep seeing threads bout too much back pressure. So I'm thinking bout the pt88. But it has the same exhaust size exhaust housing. But I'm thinking I could make more power with it than the tc78. Would it be beneficial to make the swap? Both are t4s.
On The Tree
iTrader: (11)
Joined: Jun 2005
Posts: 140
Likes: 0
From: Left Texas, now in Camarillo, CA
Go PT80 or PT88. The exhaust a/r ratio is the same but the PT's have bigger turbine wheels and will flow more than the TC78.
I run a PT80 Rearmount on my '98 Vette 408 and just confirmed a 2 to 1 ratio of backpressure to boost. At 9.5# of boost I had 20# of backpressure just before the turbo inlet. At 14# of boost I had 30# of backpressure.
So, I think anything smaller for a turbine wheel is gonna choke a 400+ cid motor. Just my .02
I run a PT80 Rearmount on my '98 Vette 408 and just confirmed a 2 to 1 ratio of backpressure to boost. At 9.5# of boost I had 20# of backpressure just before the turbo inlet. At 14# of boost I had 30# of backpressure.
So, I think anything smaller for a turbine wheel is gonna choke a 400+ cid motor. Just my .02
I had a similiar question and was told by Jose at Forced Induction that you can't compare A/R numbers between turbos unless it's within the same family of turbo. In comparision my ST80 with a 1.1 a/r has less backpressure than my old TC76 with a 1.15a/r
What transmission? I would do something t6, there have been quite a few failure's with PTE88's on 400 inch motors. Though, I do know they started building the PTE88's with larger exhaust wheels recently. Are you space limited? Goals for the car?
Trending Topics
At the moment very space limited. The car is a 98 TA. Really just want a really fast street car I can enjoy and push it a little whenever I have the urge. Oh and it's a t56 at the moment.
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
Gas Monkey Built a 6-Wheel Ferrari Testarossa With a Corvette LT4 Engine
Verdad Gallardo
7 Most Reliable High-Performance Engines GM Has Ever Built
Verdad Gallardo
Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin
Verdad Gallardo
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
https://ls1tech.com/forums/forced-in...ron-346-a.html
check that out its still not tuned all the way so no numbers
check that out its still not tuned all the way so no numbers
